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. 2021 Aug 31;9:718996. doi: 10.3389/fbioe.2021.718996

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Copyright © 2021 Ke, Chen, Wang, Hua, Lu, Song, Luo, Liao, Li, Ma, Shi, Wang, Li, Wu, Zhang and Yang.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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ROM and IDP of different revision surgeries for the treatment of two-level ASD. (A) ROM in flexion. (B) ROM in extension. (C) IDP in flexion. (D) IDP in extension.